Fig. 4. Phosphorus-31 nuclear magnetic resonance (31P NMR) spectra of water extracts from soils either amended with poultry slurry (A) or amended with pig slurry (B). MDP denotes the P standard.
Fig. 4. Phosphorus-31 nuclear magnetic resonance (31P NMR) spectra of water extracts from soils either amended with poultry slurry (A) or amended with pig slurry (B). MDP denotes the P standard.